Malicious PDF — malware analysis report

Static analysis result for SHA-256 4353fc0086afc182…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 13:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fac7195151271679f7d608c1b3d0949f SHA-1: 97e981eb5cffb9846559d07a8493d8252918d3e6 SHA-256: 4353fc0086afc18202e04492fde4a8711a260104c3b0e566da717a7c87a059fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=voip+recorder+android
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae32f1508---kemisilososavodovewog.pdf
    • http://studiotecnicodambra.eu/userfiles/files/ramunexevarovoromirusile.pdf
    • http://progettarecasa.com/userfiles/files/25805002635.pdf
    • https://acmfashion.vn/uploads/files/befumo.pdf
    • http://taixingchem.com/uploadfile/file/20210909192621345.pdf
    • http://roocenter.ru/upload/file/16273991143.pdf
    • https://flyags.com/editorResources/file///11232147589.pdf
    • https://kominove-centrum.cz/media/files/file/gisilezimetalutir.pdf
    • https://guclupin.com/calisma2/files/uploads/86524251774.pdf
    • https://sweetburden.com/upload/users/files/13369522313.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/81355023465.pdf
    • http://brilspa.ro/userfiles/file///31733783034.pdf
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/12088098825.pdf
    • https://ibrahimkoc.com/images/Media/files/duxurikusojatukibedit.pdf
    • http://www.siposferenc.hu/html/fevagaxogajafavuwesoresun.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/27764522975.pdf
    • http://banglenhospital.com/UserFiles/File/97647202131.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161391588e18e0---xixob.pdf
    • http://hoanggiaphatland.com/uploads/image/files/81175940264.pdf
    • http://jinistudy.com/_UploadFile/Images/file/60753279148.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/67866767264.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161470925ee59d---57278512611.pdf
    • https://brihat-group.com/assets/userfiles/files/10239595665.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/42934087662.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d2.bin
2b42bf7b27562e833a550076ce87adbfc06ce43de0482ccdbac5e816d6d83773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 17056 bytes
font_01_sfnt_off00010626.bin
c3719d0619e097a895664a2968af6a960b89d2e9222dfac03e373f8c0656ac3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 10164 bytes
font_02_sfnt_off00011cf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 16792 bytes

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